document.getElementById("loginPage").innerHTML = `
<style>
html{
    background: url('./images/bg2.png');
    background-size: cover;
    background-attachment: fixed;
}
*{
    /* 初始化 */
    margin: 0;
    padding: 0;
}
.box{

    /* 100%窗口高度 */
    height: 100vh;
    /* 弹性布局 水平+垂直居中 */
    display: flex;
    justify-content: center;
    align-items: center;
    /* 渐变背景 */
    /* background: linear-gradient(200deg,#f3e7e9,#e3eeff); */
}
.container{
    background-color: #fff;
    width: 650px;
    height: 415px;
    border-radius: 15px;
    /* 阴影 */
    box-shadow: 5px 5px 5px rgba(0,0,0,0.1);
    /* 相对定位 */
    position: relative;
    top:5%
}
.form-box{
    /* 绝对定位 */
    position: absolute;
    top: -10%;
    left: 5%;
    background-color: #58cff0;
    width: 320px;
    height: 500px;
    border-radius: 15px;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
    /* 动画过渡 加速后减速 */
    transition: 0.5s ease-in-out;
}
.register-box,.login-box{
    /* 弹性布局 垂直排列 */
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}
.hidden{
    display: none;
    transition: 0.5s;
}
h1{
    text-align: center;
    margin-bottom: 25px;
    /* 大写 */
    text-transform: uppercase;
    color: #fff;
    /* 字间距 */
    letter-spacing: 5px;
}
input{
    background-color: transparent;
    width: 70%;
    color: #fff;
    border: none;
    /* 下边框样式 */
    border-bottom: 1px solid rgba(255,255,255,0.4);
    padding: 10px 0;
    text-indent: 10px;
    margin: 8px 0;
    font-size: 14px;
    letter-spacing: 2px;
}
input::placeholder{
    color: #fff;
}
input:focus{
    color: #58cff0;
    outline: none;
    border-bottom: 1px solid #58cff0;
    transition: 0.5s;
}
input:focus::placeholder{
    opacity: 0;
}
.form-box button{
    width: 70%;
    margin-top: 35px;
    background-color: #f6f6f6;
    outline: none;
    border-radius: 8px;
    padding: 13px;
    color: #58cff0;
    letter-spacing: 2px;
    border: none;
    cursor: pointer;
}
.form-box button:hover{
    background-color: #b9f8b9;
    color: #5a5656;
    transition: background-color 0.5s ease;
}
.con-box{
    width: 50%;
    /* 弹性布局 垂直排列 居中 */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    /* 绝对定位 居中 */
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}
.con-box.left{
    left: -2%;
}
.con-box.right{
    right: -2%;
}
.con-box h2{
    color: #8e9aaf;
    font-size: 25px;
    font-weight: bold;
    letter-spacing: 3px;
    text-align: center;
    margin-bottom: 4px;
}
.con-box p{
    font-size: 12px;
    letter-spacing: 2px;
    color: #8e9aaf;
    text-align: center;
}
.con-box span{
    color: #58cff0;
}
.con-box img{
    width: 150px;
    height: 150px;
    opacity: 0.9;
    margin: 40px 0;
}
.con-box button{
    margin-top: 3%;
    background-color: #fff;
    color: #b7d8c2;
    border: 1px solid #d3b7d8;
    padding: 6px 10px;
    border-radius: 5px;
    letter-spacing: 1px;
    outline: none;
    cursor: pointer;
}
.con-box button:hover{
    background-color: #b7d8c2;
    color: #fff;
}

</style>
<body>
    <div class="box">
    <div class="container">
        <div class="form-box">
            <!-- 注册 -->
            <div class="register-box hidden">
                <h1>注册</h1>
                <input type="text" placeholder="用户名">
                <input type="email" placeholder="邮箱">
                <input type="password" placeholder="密码">
                <input type="password" placeholder="确认密码">
                <button>注册</button>
            </div>
            <!-- 登录 -->
            <div class="login-box">
                <h1>登录</h1>
                <input type="text" placeholder="用户名">
                <input type="password" placeholder="密码">
                <button>登录</button>
            </div>
        </div>
        <div class="con-box left">
            <h2>已有帐号？</span></h2>
            <p>请登录🚀</p>
            <button id="login">去登录</button>
        </div>
        <div class="con-box right">
            <h2>没有帐号？</span></h2>
            <p>立即注册吧😃</p>
            <button id="register">去注册</button>
        </div>
    </div>

</div>
</div>
 
</body>

`;
 // 要操作到的元素
 let login=document.getElementById('login');
 let register=document.getElementById('register');
 let form_box=document.getElementsByClassName('form-box')[0];
 let register_box=document.getElementsByClassName('register-box')[0];
 let login_box=document.getElementsByClassName('login-box')[0];
 // 去注册按钮点击事件
 register.addEventListener('click',()=>{
     form_box.style.transform='translateX(80%)';
     login_box.classList.add('hidden');
     register_box.classList.remove('hidden');
 })
 // 去登录按钮点击事件
 login.addEventListener('click',()=>{
     form_box.style.transform='translateX(0%)';
     register_box.classList.add('hidden');
     login_box.classList.remove('hidden');
 })